Project Looking Glass LiveCD

Code-named Project Looking Glass, was a proof-of-concept project by the Advanced Software Technology Team of Sun Microsystems a while back.
PLG3D (Java based development) is a desktop environment written for Linux, similar to the ones that are currently available, except it implements 3D spatialization allowing a whole new feel for desktops.
Open-source development on PGL3D is happening here, with a LiveCD!
Via Slashdot